Super Springs International Presents – SumoSprings Bump Stops for Your 5th Gen Toyota 4Runner: Complete Install Guide & Overview
SumoSprings are a line of bump stops designed and manufactured by SuperSprings International. They are offered for the Toyota, 4Runner, Tacoma, Tundra, along with many other makes and models. SuperSprings International has offered load-carrying enhancement suspension parts for many different trucks, and SUVs since 1998.
With a platform such as the 4Runner, we have many different options when it comes to building out these rigs. Whether you want to build a badass rock crawler, a full-blown overland build, or just to enhance to ride quality of your daily driver, SuperSprings International has an option for you – and that’s what makes them truly unique.
Well, let’s first introduce the company…
Who is SuperSprings International?
SuperSprings International is the company. SuperSprings International has been designing and manufacturing American-made suspension products since 1998. Their product line includes many types of suspension load-carrying enhancements for trucks, SUVs, trailers, jeeps, RVs, and everything in between.
What are SumoSprings?
SumoSprings is a product line that SuperSprings International offers. SumoSprings are the first load-assisted airless airbags on the market. This doesn’t necessarily mean that SumoSprings’ sole purpose is for towing though. In fact, the Blue and Black SumoSprings are designed to replace the factory bump stops providing a better, smoother ride all around, for both on-road and off-road applications. They are maintenance-free, do not leak air, and do not require airlines or compressors. They enhance the load-carrying/towing ability and most importantly for the 4Runner, they reduce and stabilize sway. Overall, they will improve driver control and ride comfort when daily driving, off-road driving, and even rock crawling.
There are two different density options to choose from; Blue and Black. The blue SumoSprings are made of a softer density material, while the black is made of more firm density material.
The blue SumoSprings takes less weight to compress which results in a softer unloaded and loaded ride. The black SumoSprings have a higher density, meaning there’s more material packed into the same size SumoSpring, which in turn necessitates more applied weight to compress it. This is what gives the black version a higher load rating, but also what creates a stiffer unloaded ride. In most cases, the blue version will apply to most 4Runner drivers on the road.
- 1400 (lb) Capacity at 50% Compression
- 1800 (lb) Capacity at 50% Compression
Features & Specs:
- Designed, made, and supported in the U.S.A.
- Enhances load capacity
- Reduces and stabilizes sway
- Improves handling
- Improves overall ride comfort
- Compress up to 80% of original height with full memory rebound
- One-piece unit attached on one side used as a replacement/upgrade to factory bump stops
- Progressive spring rate with superior damping properties
- Made from patented micro-cellular urethane
- Guaranteed not to leak or rupture
Find it Online
- SumoSprings Rear for Toyota 4Runner (1400lb – Blue): Check Price
- SumoSprings Rear for Toyota 4Runner (1800lb – Black): Check Price
- Coil SumoSprings (front coilover insert for additional weight): Check Price
Timbren vs SumoSprings
Timbren offers a reliable aftermarket bump stop that I’m sure many of you are familiar with. These bump stops are progressive, which means that the more they compress, the more they resist compression. This is actually what offers a better ride, more so off-road.
The main difference in the SumoSprings is that although they are also a progressive bump stop, they adjust automatically to load or compression. This comes in handy on the trail because this type of bump stop won’t limit your travel as much as the competitors. Also, the SumoSprings provide a much smoother contact patch on the axle. We found them to be noticeably smoother than the Timbrens.
As I mentioned before, these bump stops have a progressive spring rate that adjusts automatically. This means that the patented micro-cellular urethane is continually adapting to how much load is upon it at any given time. This alone is a huge benefit when it comes to offroad applications because you will have more control of your up travel.
If you plan on off-roading your 4Runner, then you should invest in aftermarket bump stops. The bump stops by SumoSprings are a perfect alternative to stock bump stops as they provide the protection you need from harsh bottom-outs all while providing enhanced ride comfort.
Even the mild to rough terrain getting to the actual trailhead is going to be much more enjoyable with a set of these.
SumoSprings have shock damping properties which means the ride quality off-road is going to be a night and day difference.
On-road driving with the SumoSprings is just as enjoyable as off-road driving. The highly durable closed cell microcellular polyurethane material provides a plush ride over bumps and rough roads while providing complete control of the vehicle. When you hit something like a speed bump, the SumoSprings will help soak up the bump, but when you’re doing a lot of cornering, the SumoSprings will help provide rigidity.
If you are going with an overland build, then consider getting some SumpSprings bump stop replacements plus SumoSprings coil reinforcements. These inserts are installed into the middle of the coil spring and have a similar purpose as airbags. They will stiffen your suspension, which keeps the 4Runner from handling like a boat when it’s loaded down.
If you plan on towing frequently, some kind of spring reinforcement is needed. The reason for this is the 4Runner was not designed to support a ton of weight. Airbags, or in this case airless airbags, are designed to support the weight while towing, which in turn gives you more control. This is a must-have for those long trips while pulling a camper or even short trips towing your boat to the lake.
While towing, these bump stops act as airbags but without the air. This will not only provide a much more enjoyable ride, but your rear-end will no longer sag. If you are looking at towing, you may want to consider the black SumoSprings bump stops. The bump stops we received are the blue SumoSprings. The black SumoSprings are designed to support more weight.
There are many guys who have installed airbags for towing but unlike airbags, SumoSprings are guaranteed to not pop or lose air. If you’ve ever owned airbags, you also know how sketchy it can be working on them. Not to mention, the amount of time an install takes.
If you are looking to increase the stability of your 4Runner while towing heavier applications, you may want to consider getting the Coil SumoSprings as we mentioned above. These won’t support the weight of a trailer, but they will prevent harsh bottom-outs, body roll, nose dive, and more.
Features of the Coils
- Sold as a pair (left and right)
- Fits both front and rear coil springs
- Coil SumoSprings simply slide between the turns of coil springs
- Enhance front suspension when fitting snow plow, winch, or bumper
- Enhance rear suspension when adding tow hitch
- Reduces side-to-side body roll and front end dip
- Produced from SumoSprings closed micro-cellular urethane
- progressive spring rate with superior damping properties
- Coil capacity increased by 15% to 30%
- Typical installation completed in less than 30 minutes
- Never load any vehicle beyond the manufacturer’s GVWR
The Coil SumoSprings slip right into your factory or aftermarket coils (both front and rear). The purpose of these is to help prevent sagging when your 4Runner is loaded down or nose dive in the front when braking. This is the middle ground for someone looking to do a little bit of towing or a great addition to running a set of blue/black SumoSprings.
The install for the SumoSprings is very straightforward. I took the tire off on one side just to get better pictures, but on the other side (passenger side) I left the tire on and it wasn’t any more difficult. If you choose not to take the tires off then the only tool you’ll need is a 13mm gear wrench.
Tools and Materials
- 13mm Gear Wrench
- New Hardware (provided)
- Blue Locktite (provided)
- Breaker Bar (optional)
- Impact (optional)
SumoSprings Bump Stops Install
Step 1. Remove Factory Bump Stops
After you have parked the vehicle on a hard, level surface and engaged the emergency brake, place blocks in front and behind the wheels to prevent rolling. Observe all safety precautions and wear safety glasses.
Raise the rear of the vehicle allowing the axle to hang freely and rest the frame on the safety jack stands rated for the weight of the vehicle. Removal of the rear wheels is optional. Starting on the driver’s side, unscrew the two bolts and remove the factory bump stop from the underside of the frame.
Step 2. Attach SumoSprings to Mounting Bracket
Attach the mounting bracket to the top of the SumoSprings using the supplied M8 hex bolt and washer after applying a drop of blue thread locker to the threads of the bolt. Use the center of the three holes on the top part of the bracket.
Step 3. Mount SumoSprings
Attach the assembly to the underside of the frame using the supplied M8 hex bolts and washers after applying a drop of blue thread locker to the threads of the bolts. Be sure to position the bracket so that the SumoSprings is offset 1/2″ outboard (toward the wheel). Don’t tighten down the bracket all the way just yet.
Step 4. Center SumoSprings on Axle
There are slotted holes in the bracket for the bump stops which allow you to move the bracket left or right in order to center the bump stop on the axle. Keep in mind that when the axle flexes, it also rotates forward a little bit with the factory 4-link.
As you can tell in the picture, the previous bump stop was a bit too far forward. With the axle level, place the new bump stop a little bit in front of it and tighten down the hardware. When the axle comes up in this position, it will be centered with the new bump stop.
Step 5. Put Everything Back Together
If the rear wheels were removed, you can now reinstall them. (Torque wheel nuts to manufacturers spec). Clean up all your tools and call it a day.
Before you take it for a spin, ensure emergency brake cables are not touching the SumoSprings. Secure any cables out of the way with zip ties or by re-routing. Ensure all A/Clines, brake cables, and frame are clear of contact or interference.
Overall, we are extremely impressed with the quality of these SumoSprings. We replaced our Timbren bump stops (a very reputable company) with a set of these Blue SumoSprings on the rear of the white 4Runner.
The bump stops feel great both on and off the road. I noticed a smoother contact while wheeling around the rocks over the Timbrens. When wheeling with the Timbrens, you can literally feel the bumpstop hit the axle – it’s better than stock but the Blue SumoSprings are much smoother.
These really have stabilized our sway, improved the overall driver control, ride comfort, and will enhance load carrying ability if we tow anything.
The thing that stood out to us about SumoSprings is the fact that they have three options available for the 4Runner. No matter what route you go with your 4Runner build, SumoSprings has an option for you.
I recently installed on a stock 2019 4Runner. My truck is lightly loaded, roof rack and cargo box. Sliders and rear storage. I notice the Sumo springs sit on the axle while stationary. I was thinking of removing the extra plate which is not installed in this article. What is the reason for that?
Nice article. Thank you. Any foreseeable issue installing these on a truck with KDSS?
I installed both front and rear SumoSprings (blue) this weekend. I don’t have the proper jack and jackstands currently so I didn’t remove the wheels for this install. Directions indicate it is optional. I agree though with the wheel off the install time would be cut in half at least.
Fronts – I did need to jack up and get the front wheel off the ground. Even with the wheel off the ground getting the SumoSpring started in the threads was a little tough. The bolts they supply are LONG, they could shorten them by 1/4 inch and there would still be more than enough and make install way easier.
Overall the install on the front is pretty easy, 30 to 40 minutes tops assuming you have all the right tools. I had to drive to a local ACE and borrow a pipe wrench to loosen the stock bumps.
Rears – did not jack up the rear. There is plenty of space between the axel and the new SumoSpring. The stock bumps came off super easy and with the proper ratchet extensions the rears installed really easy as well. It is a little hard to get the SumoSprings lined up from underneath the truck but pretty sure I got it.
Install on the rear was probably right at 30 mins.
One question I have for others that have done the rears. SumoSprings provides a support plate and in all the youtubes and the Trail4R install no one uses the plate. I did. I figured it would add a bit more strength and they wouldn’t include it if it wasn’t necessary but?????
Has anyone else used it?
Anyone know, factually,
and with measurements, if these limit suspension articulation?
How would you say these compare against Duro bump stops?
Great upgrade! The front bump stops really reduce the ‘brake dive’ on the street. Getting ready to hit the trials soon to test the rear bump stops. Very easy install…just be cautious on taking off the old front bump stops. I got a little mixed up and snapped the bolt and it was PITA to get out. Spraying a little brake cleaner on the old bolt, letting some penetrating oil sit for a few hours and using channel lock pliers is key.
I’ve had the blue sumo springs bump stops installed for about two months now. I’m a musician who loads up a lot of gear from time to time. It’s been a game changer for me. I would highly recommend them as they are the best suspension upgrade you can do. Very affordable and super easy to install. I didn’t take off my tires and it took about 30 minutes to get it done.
I just ordered these for my 2021 TRD OR. It seems that the factory bump stop is attached with a 12mm bolt and the supplied SUMO bolt seems to be too big to thread into the captive nut. The set is for current 4Runner and you also had a 13mm wrench to install. Does this make sense that my factory bolt is 12mm?
Is CSS-1069 the correct size for the 2016 4Runner TRD PRO? thanks!
I have a mild lift on my 4Runner so I called the company for my application. They offer different size spacers in order to maintain their intended distance from the axle.
Seems like these bump stops will limit the range of motion of the suspension off road. I don’t see how that is a good thing?
Indeed I too wonder if these bumpstops reduce the amount of wheel articulation in a stock suspension configuration? Has anyone taken before and after measurements? I sent these questions to SumoSprings but never got a response. As we all know, a mod can compromise other factors.
So if I’m understanding correctly installing both these (front coils + rear stops) on a stock suspension (2019 SR5) would improve excessive dive under hard braking and sway when cornering. How would this compare to say a shock upgrade (e.g., Bilstein 5100)? That is often a recommended upgrade to achieve the same thing. But I imagine overall ride quality is improved more with the shock upgrade. I would love to hear from anyone who may have experience with both.
Installed Bilstein 5100 shocks on the front of my 2016 TEP and they got rid of the unnerving « panic stop nose dive from hell ». Am very happy.
I am really interested in how the front coil inserts behave as well. Nose dive on a stock 4Runner is painful at times. Could be a great investment if this can help that condition while waiting in a fully suspension upgrade.
The ride would be much better on a suspension upgrade vs. SumoSprings alone. SumoSprings aren’t meant for a suspension replacement but a suspension enhancement. They enhance/decrease the body roll and increase load carry ability without compromising controlled driving characteristics. Think of it as an air bag system – without the need to air up your bags. I wouldn’t install only these for body roll and nose dive – I would pair them with a good suspension (even just a Bilstein 5100 or entry-level OME kit) for an even better experience than without.
Is CSS-1069 the correct size for the 2018 4Runner? (TRD Off Road) thanks!
Will this keep my 4runner from twisting like a tornado when I lock up the brakes? Not that Im stomping on them often
Are you referring to the harsh nose dive on braking? If so then no the black or blue SumoSprings wouldn’t perform there, these are for the rear of the 4Runner. For the front, you would want their coil SumoSprings. Those would slot into your front coilover springs and prevent nose dive.
Apologies, so I understand correctly, if you put the Blue SumoSprings on the rear, can you put the Coil SumoSprings on both front and rear or would they just go on the front?
Siiiiiick, thank you. my 2nd Gen never had this issue.
I may have to try the Coil SumoSprings. Could really help with the nosedive and added weight of skids, sliders, etc. Cant seem to see if anyone has done these on the front of a 4runner.
We’ve seen people use them on 4Runners and a lot of other truck setups. I personally have them on the front of my F250 for the heavy duty bumper / grill. -Adam
Even in the front? I did the vehicle look up and it only listed rears.
they now offer front and rear. Got a set on mine and like them so far. I could hit a speed numb at 35-40 and won’t feel anywhere near as harsh as stock. I got new suspension installed with these so that comes in to ply too.
We don’t have them listed at the moment but you would use our Coil SumoSprings lookup page to figure yours out. One measurement, pretty straightforward. https://www.supersprings.com/coil-sumosprings#find-your-coil – Adam
Thanks for this — any consideration for stock vs lifted heights?
Both stock and lifted 4Runners would be fine. The only consideration is that if you have a lift there will be more space, so more travel required before the SumoSprings enagage. We are running a 3″ rear spring on this 4Runner and have lots of uptravel until the SumoSprings connect. With a stock suspension, you are going to have less distance between the axle and SumoSprings so you will instantly feel an increase in ride comfort and less sway/roll. These would be great for a 4Runner sitting on stock suspension or any lift kit.
I just finished installing these on my 21 ORP on stock suspension. There is a little under 1 finger width (yes technical measurement) between the axle and the blue sumo spring when my rig is not loaded.
Ironman FCP stage 2 (2″ performance rear spring) coming soon so I expect that space will increase a bit.
How’s the ride quality un-loaded? Did you notice any difference in general around-town ride comfort?
Unloaded – no difference as the SS were not in constant contact.
I’ve now got a RTT on top and C4 sliders installed (about 220lbs constant load). That weight put the SS in constant contact with the axle. The feel is surprisingly good. Last weekend, also I hung a KTM 500 EXC off the back and again – surprisingly good – no ass droop. I’m glad I went with this.
When my Ironman setup comes in, I suspect I’ll be “floating” more and only relying on the SS only when the fully loaded (RTT, moto, etc)..
Exactly what I was looking for my WR250!